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Discussion papers
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 04 Nov 2019

Submitted as: research article | 04 Nov 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Tracer-based investigation of organic aerosols in marine atmospheres from marginal seas of China to the northwest Pacific Ocean

Tianfeng Guo1, Zhigang Guo1, Juntao Wang2, Jialiang Feng3, Huiwang Gao2,4, and Xiaohong Yao2,4 Tianfeng Guo et al.
  • 1Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
  • 2Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China
  • 3School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
  • 4Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, China

Abstract. We investigated the geographic distributions of organic tracers in total suspended particles over marginal seas of China, including the Yellow and Bohai seas (YBS) and the South China Sea (SCS), and the northwest Pacific Ocean (NWPO) in spring, when Asian outflows strongly affect downwind marine atmospheres. The comparison of levoglucosan observed in this study with values from the literature implied that the contribution from biomass burning emissions to marine aerosols over the NWPO may have increased largely over the last decades. The increase led to the mean value of levoglucosan (8.2 ± 14 ng m−3) observed over the NWPO closer to that over the SCS and almost half of that over the YBS. Small geographic differences in monoterpene-derived and sesquiterpene-derived secondary organic tracer concentrations were obtained among the three atmospheres, although the causes may differ. By contrast, a large difference in isoprene-derived secondary organic tracer concentrations was observed among the three atmospheres, with the sum of tracer concentrations over the SCS (45 ± 54 ng m−3) several times and approximately one order of magnitude greater than that over the YBS (15 ± 16 ng m−3) and the NWPO (2.3 ± 1.6 ng m−3), respectively. The geographic distribution of aromatic-derived secondary organic tracers was similar to that of isoprene-derived secondary organic tracers, with a slightly narrower difference, i.e., 1.8 ± 1.7 ng m−3, 1.1 ± 1.4 ng m−3 and 0.3 ± 0.5 ng m−3 over the SCS, the YBS and the NWPO, respectively. We discuss the causes of the distinctive geographic distributions of these tracers and present the tracer-based estimation of organic carbon.

Tianfeng Guo et al.
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Short summary
This study investigated tracer-based organic matter observations in TSP collected over two marginal seas of China and the NWPO in spring, when the East Asian monsoon carries biogenic and anthropogenic aerosols over these oceanic zones. The geographical difference may be related to emissions of primary particulate organics and gaseous precursors as well as formation processing of secondary organics in various atmospheres. And we further present the tracer-based estimation of organic carbon.
This study investigated tracer-based organic matter observations in TSP collected over two...